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annotate rust/hg-core/src/operations/debugdata.rs @ 46503:2e2033081274

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rust: replace trivial `impl From ?` with `#[derive(derive_more::From)]` Crate docs: https://jeltef.github.io/derive_more/derive_more/from.html Differential Revision: https://phab.mercurial-scm.org/D9875
author Simon Sapin <simon.sapin@octobus.net>
date Tue, 26 Jan 2021 20:05:37 +0100
parents 3e2d539d0d1a
children b274aa2f20fd
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1 // debugdata.rs
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2 //
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3 // Copyright 2020 Antoine Cezar <antoine.cezar@octobus.net>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 use crate::repo::Repo;
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9 use crate::revlog::revlog::{Revlog, RevlogError};
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10
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11 /// Kind of data to debug
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12 #[derive(Debug, Copy, Clone)]
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13 pub enum DebugDataKind {
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14 Changelog,
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15 Manifest,
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16 }
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17
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18 /// Error type for `debug_data`
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19 #[derive(Debug, derive_more::From)]
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20 pub enum DebugDataError {
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21 /// Error when reading a `revlog` file.
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22 #[from]
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23 IoError(std::io::Error),
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24 /// The revision has not been found.
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25 InvalidRevision,
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26 /// Found more than one revision whose ID match the requested prefix
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27 AmbiguousPrefix,
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28 /// A `revlog` file is corrupted.
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29 CorruptedRevlog,
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30 /// The `revlog` format version is not supported.
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31 UnsuportedRevlogVersion(u16),
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32 /// The `revlog` data format is not supported.
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33 UnknowRevlogDataFormat(u8),
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34 }
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35
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36 impl From<RevlogError> for DebugDataError {
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37 fn from(err: RevlogError) -> Self {
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38 match err {
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39 RevlogError::IoError(err) => DebugDataError::IoError(err),
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40 RevlogError::UnsuportedVersion(version) => {
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41 DebugDataError::UnsuportedRevlogVersion(version)
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42 }
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43 RevlogError::InvalidRevision => DebugDataError::InvalidRevision,
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44 RevlogError::AmbiguousPrefix => DebugDataError::AmbiguousPrefix,
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45 RevlogError::Corrupted => DebugDataError::CorruptedRevlog,
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46 RevlogError::UnknowDataFormat(format) => {
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47 DebugDataError::UnknowRevlogDataFormat(format)
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48 }
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49 }
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50 }
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51 }
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52
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53 /// Dump the contents data of a revision.
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54 pub fn debug_data(
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55 repo: &Repo,
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56 revset: &str,
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57 kind: DebugDataKind,
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58 ) -> Result<Vec<u8>, DebugDataError> {
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59 let index_file = match kind {
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60 DebugDataKind::Changelog => "00changelog.i",
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61 DebugDataKind::Manifest => "00manifest.i",
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62 };
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63 let revlog = Revlog::open(repo, index_file, None)?;
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64 let rev =
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65 crate::revset::resolve_rev_number_or_hex_prefix(revset, &revlog)?;
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66 let data = revlog.get_rev_data(rev)?;
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67 Ok(data)
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68 }